Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2cd154b5e45834…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 22:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a804f74c2a21d3248fdd9d5b7b102b5d SHA-1: 0b81f65dcced121804b1892c51f1720bd61852e6 SHA-256: fa2cd154b5e458348bcffebd44d1851a60ab0d4da2a2e4d43af17d4aa379377d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.smartfutureexpo.com/ckfinder/userfiles/files/pofatag.pdf In PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/90830689780.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109020548498930.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/78892071387.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902103114.pdfIn PDF document text
    • http://humanlitech.com/files/files/71205436800.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/senirekunojebiluzuja.pdfIn PDF document text
    • http://boldogelet.hu/media/sanojevokulupod.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/34707217700.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunajifudaxi.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nusepaxizavudo.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/22684582160.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131b6b5e13---32448669058.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/kilop.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/67447855345.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1398c318---gotekamegizubivom.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tuxotogapurajavabimux.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/powosivilodijigisi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/85sio8io3hchofc322t3ueckmu/melunu.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/turipinodotog.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jibisujirotapobesaxamira.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/81725000926.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/98458722121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=my+phone+keeps+blinking+on+and+offPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 17816 bytes
SHA-256: ad50d86a9e0a9dbbbbefd7bf780b7614f46f9cd0768370991967f1d66654858c
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10920 bytes
SHA-256: efdac01fa5b856e9bad60a30784e784f53f82a6a060fec0ae629224101eb2dec
font_02_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.